Wave filter receiving circutis



Aug' 9 192,7 P. WELCH ET AL w-AVE FILTER RECEIVING CIRCUITS Filed Feb. 6;;1925

akamu' Patented Aug. 9, 179727.

'ffm/wm mi am I 'wAvE nimmt crncnrrs Appiieativi jalea February aises; 'serieta v AThis 'invention relates to improvements in radio receiving systems, and particularly to means for increasing-'the eiliciency =of e vOperation of adetector'system.-

' This invention comprehend's 4the 'provision ofjasecondary anode in a translating device nal.

Y, Vform of the invention, ,l

used for detecting 'radio signals 'operable in an output circuit of the device independent` of l a primary output circuit containing 'j a sound reproducer, which is adapted tof inr crease the eiiiciencyof operation of viceand the `receiving system f'by providing afleakage for the discharge yof the device andfrelievng 'the load -on the input cir'- :cuitfand the grid, inladdition 4to which `a leakagefpath is providedl yfor oscillation which A frequently interrupts and interferes witlithe' eiiicient reception of a desiredy sig- `The invention other .v objects which/aire. more particularly pointed out in the following detailed description and cla-im directed to the Ypreferred it being understood that various changes in the invenhowever,

be made withoutl departing from tion may the spiritand scope thereof as herein set forth.v

A lating device constructed 1 indicatesa vacuumftub'e constructed for use as a Vdetector tube, having a pair 'of Y series connected lament sections 2 form1ng sections 2 and' interconnected as indicated a connection Y to the terminal 5 of the tube. The'lilamentv the cathode. of the tube, a pair of grids 3 arranged at opposite sides of the filament at 4, and finally provided with sections 2 are connected to a pair of terminals 6 and 7 inthe usual manner, in order that the filaments may be interposed in a suitable circuit with a source Vof energy 8 adapted to be controlled by a rheostat for the-1 dee f comprehends numerous heating the filament sections:f'iincandes-i' A pair of; pnteS-Jioaanafii' iormiiigfthe vare mounted fiat [opposite sides ofl the Ar-til'ain ents and 1 'also gthegrids 'as 'illustrated in Fig. 'f ljof fthe drawing, "the primary 'anode 10 having electrical connection-'j with?l the primary and 4secondary anodes` of the f tube positive'terminalhof` the source of energy v221:,whiler the "secondary "anode 11is1 preferj ably "connected lgtofthefpositive endofthe :I filamentwasfindicated; at within the-body off'ithe tubea. 'f'

i @E "dsimdiv allV additional contact v A' FF 1 rprovided on 'the base 'of 'th'le tube Vforgreceivr 1 e ingascircuitconnectio'n from ther secondary Vvanode;11,'fin` orderlthat an exterior circuit may be connectedlwiththe' anode :inathe Y' l I 'event it is desired to usean .inductanceg 'cal =p acity,"hor'resistanceyjor,a" combination of either m1 the l circuit between f thez' anode .11 f

ing the' energy vreceived .inthe input` circuit the positive'filament connection for assisting in the operation ofthe tube in clear- 80 'y of oscillations which are not desired inthe I output circuit of the primary anode. j

plel lan antennacircuit indicatedby the niivv meral 14. generally, which includes 'a-,varif Fig. 2, showing the wiringdfagram, offv a regenerative circuit illustrates for` examable capacityj15 and a variabletuninglin-l ductancel, with the usualground `c 'onnection 17.

.The input circuit to the electron .dischargedeviceV 1 includes the inductance 16 having -theisualcometon 18 .with therdoubiegrid. l 3, ,3 and the grid return circuit .3'0I1ne'lVv y through thewirel 19 to the positivesideof the filament circuit at 23,'

The output circuit of a connection 20with the Aprimary anode 10 a feed ba'ck'coil21, the soundreproducer 22 and a suitable source ofpotential 24havin`g' 1 r thepositive terminalconnected so as toi'mpress theanode 10 with positive potential the device 'includes while the negative terminal of the source of 1 at the point 23. Y' a l It is to be' understood that the input and output circuits of this electron discharge device as above described, are of the usualtype wellknown in the art and may beV ofany .i other `desired design o f the several typesv 1. 'The present invention.c'oinprehends.par

now used in the art. 1

ticularly theprovision ofthe secondary an- Y energy 2iis-connected to the filamentcircuit odeillfhavingitlie direct connectionlas indi- 'minalof the cathode or iilament 2, as a re sult of which it Will loef*ein-irgizedwith` a positivepotentia'l `with respect to the 'cath- Vodeequal to the potential ,offthe source.. of

ener 8 which isfalwaysofaconsiderably gy a i sm aller Value than thepcsitifye potential used for impressing apositive charge on the privmai-yg;anodei10.@k Y .-f f VAs a result, a secondary output circuit'fis f provided hy thisvinvention, thru ythe' secondary anode1l,@While-thegrid commonV to the. {input v:circuit will control the transfer of energy from hoththe primary Tand rsecondaryganodes inaccoiidanoe With the fvariationsofpotential `i-n-A the ,input-circuit 5 init-he operation l of the .invention as herein set forth, the` Signals v-impiwessed onrthe out Vpnt circuit; connected with the:cprimary` anjode l0 and reproduced in thevsoufndcrepio ducer'ZQ, are clearedt'o a:-substantial-extent oiftli'e undesirable sound :resulting freni static -distu'rhances :impressed fonrthe' an# tenna circuit7 rwinterference from vstwtions Cltgshould therefore be readily understood thatthe provisionof theseeondary anode l1 hav-ing the' direct electricale connection lWith the positive terminalofi the'cathode as Welll as .2i-'connection with the ground through the Wirel 19 serves to increase the efficiencyof c operation of a transla detecting" radio gigms What is claimed is ting deyice' used for 'Ina raidiantenergy receiving syistenn'an 1 electrons discharge device having a filamentary cathode, a grid, a primary anode, an

input- 'circuitg includingy the,l grid; and cathodei-van output circuitvinclnding the -pri 1 Vmaryy anode, catliode,aLsound-reproducer and a source ofqpotentialI forgapplying a positivecpotentjialzfto said vprimary anode; a c

45- n' ode,lasecondaryanode in saiddevice hav c source of? energy. connectedV with said cat-hing directt electrical:'connection with the positiver terminal-'of saidncathodeand enerl gized Witha'positivefpotentialbythesource A v of;y energy connected Withthe; cathode,r the 'potei'itialr impressed on the :secondary:- -anode tures. c

. PET-ER yWELCH.

AUDLEY MURPHY.; 

